Improvement in steam-boiler furnaces



A. G. RAND.

Steam-Boiler Furnaces.

NO. 138,694. Patente dMay6,1873.

Witness: Inventor.

- .i W0 MMJ JMMQ/ .Attomeys.

AM PHDTO-LITHusRAPHIc ca ms (oammns's Pnacsss' PATENT ALONZO G. RAND, OF AURORA, ILLINOIS.

IMPROVEMENT IN STEAM-BOILER FURNACES.-

Specification forming part of Letters Patent No. 138,694, dated May 6, 1873 5 application filed March 5, 1873.

' To all whom it may concern:

Be it known that I, ALONZO G. RAND, of Aurora, in the county of Kane and in the State of Illinois, have invented certain new and useful Improvements in Steam-Boiler Furnace and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon making a part of this specification.

The nature of my invention consists in the combination, with a boiler-furnace, of an interior doublewalled magazine, connected by pipes with the steam and water spaces of the boiler, and an injector supplying air and steam to the interior of themagazine, all as more fully hereinafter set forth.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation,referring to the annexed drawing, in which Figure 1 is a longitudinal vertical section, Fig. 2 a transverse vertical section, and Fig. 3 a front View, showing my invention applied to a locomotivefurnace.

A represents a part of the boiler, with openings a a, which represent the front ends of the tubes or flues of the boiler. B is the double-walled magazine, connected by tubes 1) b with the sides or water -legs and the crown-sheet of the boiler. 0 represents the air and steam injecting pipe for supplying ,air and steam to the interior of the magazine.

On the 24th day of December, 1872, a patent was granted to me for a device to be used for the same purpose as the present invention. In that case, as well as in this, I place within the furnace D a magazine, B, for holding the coal, the magazine having a closed top and open bottom over the grate-bars. This magazine is double, and in the former case the space between the two shells of the magazine Was intended to be filled and kept filled with air and steam, an injector being used for that purpose, the outlets for the air and steam be.

ing fine holes in and near the base of the magazine.

In my present invention I fill this space with water, and connect the same by means of the pipes 12 b to the water-legs or sides of the boiler, and also with the crown-sheets. This permits a perfect circulation of the water from the boiler into and through the space between the shells of the magazine. The evapcrating-surface of the boiler is thus largely increased,.and the magazine is thus prevented from burning out.

The air and steam I supply with an injector-pipe, 0, into the interior of the magazine, instead of into the space between the shells of the magazine, as in the former pat ent.

The great advantages of preventing the gases arising from the coal from passing upward through the coal and forming smoke are presented in this, as in my former patent, by having the outleton the bottom of the magazine near the grate, thus compelling the gases to pass downward through the incandescent coal and coke.

The supply of steam and air being regulated by a stop-cock, d, in the steam-injector O, the heat is easily controlled. The damper e in the feed-door E also assists in controlling the rapidity of the combustion of the fuel.

The usual practice of exhausting steam through a contracted exhaust into the stack of locomotives, for the purpose of increasing the supply of air in the furnaces of ordinary locomotives, forms a partial vacuum, and the coke is often drawn into and against the flueheads, and by friction they are worn off and the fiues made t6 leak. With my arrangement the mouth of the exhaust is not con tracted in the usual manner, but left open, thus assisting the labor of the engine, as the injectorpipe furnishes a large amount of air, and the steam, passing with the air into the coal and downward into the incandescent mass of fuel, combines with it and intensifies the combustion greatly.

Having thus fully described my invention,

FFIGE.

what I claim as new, and desire to secure by Letters Patent, is-

The combination, with a boiler-furnace, of the interior double-walled magazine B, connected, by pipes b b, with the steam and water spaces of the boiler, and the injector O,

I supplying steam and air to the interior of the magazine, all substantially as and for the purposes herein set forth. v

In testimony that I claim the foregoing I have hereunto set my hand this 5th day of A. N. MARE, J. M. lVIASON. 

